easyMultiple Choice
300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an IPv4 Access Control Lists issue:
R1# show access-lists 120
Extended IP access list 120
10 permit tcp 192.168.1.0 0.0.0.255 any eq 80
20 permit tcp 192.168.2.0 0.0.0.255 any eq 443
30 deny ip any any logWhat does this output indicate?
⚠ Common exam trap
Cisco often tests the ability to read ACL output precisely, and the trap here is that candidates may overlook the specific port restrictions (eq 80 and eq 443) and assume the ACL permits all traffic from the source networks, or misinterpret the 'log' keyword as affecting the permit/deny action.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ACL permits HTTP traffic from 192.168.1.0/24 and HTTPS traffic from 192.168.2.0/24, and denies all other traffic with logging.
The output shows an extended ACL with two permit statements: the first permits TCP traffic from 192.168.1.0/24 to any destination on port 80 (HTTP), and the second permits TCP traffic from 192.168.2.0/24 to any destination on port 443 (HTTPS). The final deny ip any any log statement explicitly denies all other IP traffic and logs matches, which is standard practice for ACL troubleshooting. Therefore, option A correctly describes the ACL's behavior.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The ACL permits HTTP traffic from 192.168.1.0/24 and HTTPS traffic from 192.168.2.0/24, and denies all other traffic with logging.
Why this is correct
Sequence 10 permits TCP port 80 from 192.168.1.0/24, sequence 20 permits TCP port 443 from 192.168.2.0/24, and sequence 30 denies all remaining IP traffic while generating log entries. The implicit deny is made explicit and auditable by the log keyword.
- ✗
The ACL permits all traffic from 192.168.1.0/24 and 192.168.2.0/24.
Why it's wrong here
The permit statements match only TCP port 80 from 192.168.1.0/24 and TCP port 443 from 192.168.2.0/24; all other traffic from those subnets hits the implicit deny. It is tempting because the source addresses are permitted, but the destination port qualifiers restrict them.
- ✗
The ACL denies all traffic from 192.168.1.0/24 and 192.168.2.0/24.
Why it's wrong here
The deny statement is sequence 30, so it only drops traffic not already matched by the two permits; those subnets' HTTP and HTTPS flows are allowed. It is tempting because a deny ip any any line appears, but its position after the permits limits its scope.
- ✗
The ACL is applied inbound on an interface and is blocking all traffic.
Why it's wrong here
The output shows only the ACL's contents; whether it is bound to an interface, and in which direction, is not displayed by show access-lists. It is tempting because the trailing deny ip any any log drops unmatched traffic, and would be correct if show ip interfaces confirmed inbound application.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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